horse·tail /ˈhɔrsˌtel/
 馬尾,古時土耳其軍旗,木賊


 Horse·tail n.
 1. Bot. A leafless plant, with hollow and rushlike stems. It is of the genus Equisetum, and is allied to the ferns. See Illust. of Equisetum.
 2. A Turkish standard, denoting rank.
 Note: ☞ Commanders are distinguished by the number of horsetails carried before them. Thus, the sultan has seven, the grand vizier five, and the pashas three, two, or one.
 Shrubby horsetail. Bot. See Joint-fir.

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 horsetail
      n : perennial rushlike flowerless herbs with jointed hollow
          stems and narrow toothlike leaves that spread by creeping
          rhizomes; tend to become weedy; common in northern
          hemisphere; some in Africa and South America